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JEE Main & Advanced Chemistry Surface & Nuclear Chemistry / भूतल और नाभिकीय रसायन Question Bank Rate of decay and Half-life

  • question_answer
    75% of the first order reaction was completed in 32 minutes. When was 50% of the reaction completed [MNR 1983; MP PET 1997; EAMCET 1998]

    A)                 24 minutes         

    B)                 16 minutes

    C)                 8 minutes           

    D)                 4 minutes

    Correct Answer: B

    Solution :

           \[N=\frac{25}{100}{{N}_{o}}\] (at \[t=32\] minutes)                                 Thus \[t=\frac{2.303}{0.693}\times {{t}_{1/2}}\log \frac{{{N}_{o}}}{N}\]


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